Message-Id: <200010281701.KAA20463@dagalas.gps.caltech.edu> Date: Sat, 28 Oct 2000 10:01:34 -0700 (PDT) From: John Galetzka Reply-To: John Galetzka Subject: [SCIGN-857] MATH and MAT2 To: scign@igscb.jpl.nasa.gov Sender: owner-scign Precedence: bulk ****************************************************************************** SCIGN Electronic Mail 28 Oct 10:01:35 PDT 2000 Message Number 857 ****************************************************************************** Author: John Galetzka Please be aware that GPS data from MATH (Lake Mathews) has degraded to the point where the north and east repeatabilities are now over two times the standard deviation. The likely reason for this is that the GPS hardware is dying after long years of service. Coincidentally, a new station, using a deeply-anchored drilled-braced monument, has been recently constructed next to the older MATH station. The name of this new station is MAT2 (Lake Mathews Two) and the first day of operation was 26 November, 2000. Data from this site will be automatically archived at SOPAC once telemetry has been established in the next week or two. Our course of action at Lake Mathews is to establish a tie between MATH and MAT2 over the next several days, repair or replace the MATH GPS hardware, then run both stations in parallel for an undetermined length of time to conduct a monument stability test as suggested by Hadley Johnson. Thanks for your attention, John Galetzka Network Coordinator Southern California Integrated GPS Network (SCIGN) USGS-Pasadena galetzka@gps.caltech.edu 626-583-7230